Fan



FIG. 1 is a perspective view of a fan showing my new design;

FIG. 2 is right elevational view thereof, the left elevational view being a mirror image thereof;

FIG. 3 is front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a fan, as shown and described. 